Mont Alto, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mont Alto, a borough in Franklin County, Pennsylvania.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind around 5 mph.
7-day forecast for Mont Alto
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy then Patchy Fog | 3 mph E | 11% |
| Wednesday | 83°F | Showers And Thunderstorms Likely | 2 to 6 mph SE | 66% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms | 5 mph S | 61% |
| Thursday | 88°F | Partly Sunny then Showers And Thunderstorms Likely | 3 to 7 mph S | 62% |
| Thursday Night | 68°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph SW | 62% |
| Friday | 87°F | Partly Sunny then Showers And Thunderstorms Likely | 1 to 6 mph SW | 56% |
| Friday Night | 67°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph SW | 56% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph W | 41% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 41% |
| Sunday | 88°F | Mostly Sunny | 1 to 6 mph W | 13% |
| Sunday Night | 69°F | Partly Cloudy | 2 to 6 mph SW | 13% |
| Monday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 9 mph W | 15% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 8 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Mont Alto (39.840, -77.556). Updated through the day.
Growing snapshot for Mont Alto
Last spring frost
Apr 27
First fall frost
Oct 20
Growing season
177 days
Hardiness zone
7a
More local growing data for Mont Alto: nearby ZIP 17237 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Blue Ridge Summit
Chambersburg
Fayetteville
Fort Loudon
Greencastle
Guilford
Marion
Mercersburg
Orrstown
Pen Mar
Rouzerville
Scotland
State Line
Wayne Heights
Waynesboro
Climate data from the nearest NOAA station, S Mtn, Pa (2.2 mi from Mont Alto). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.